supersmackdown. but before their face-off, jon stewart is here, going head to head. and he's in a fighting mood. >> oh, yeah. it's on! >>> little debate poster up there. good morning, america. happy to have lara back from a couple of days off. >> happy to be back, hi, everybody. >> elizabeth vargas is here as well. it was a big night for the white house. president obama and mitt romney facing off in the first crucial debate in denver. romney came in behind. he took the debate last night. overnight polls give romney the win. the question, now, will it boost him enough in those key battleground states? >> it was the most tweeted event in social history. our political team is standing by with a full roundup of the night. and what this means for both candidates, with just 33 days to go until the final vote. >> we're closing in right now. >>> and josh and sam, boy, you had a special visit yesterday. robin tweeted out the first picture since her transplant of your visit. >> sam and i went, hoping to raise her spirits. the morning after, our spirits remain raised. it was a beautiful afternoon. >> can'